I am about 7 months removed from reconstruction and swelling!

I am about 7 months removed from my reconstruction following a prophylactic mastectomy. I am your perfectly healthy 25 year old whose recovery was nothing but normal. One day I realized my right breast was larger (swollen) than normal and was irritated. Not the skin but under the tissue. Its gotten uncomfortable enough that it wakes me up at night, I can no longer sleep on my belly (I was able to a few months after). What is going on? My surgeon said my implant is intact and not impacted.